Dressing millstones



CARLISLE; v61., ESTABROOK.

Millstone Dress.

fvPtent'ed Aug. 28, 1846.

nnTTnn sTATns PATENT oTTion.

CHARLES CARLISLE AND EDWIN ESTABROOK, OF NORVICH, VERMONT.

DRESSING MILLSTONES.

Specification of Letters Patent No. 4,724, dated August 28, 1846.

To @ZZ whom t may concern.'

Be it known that we, CHARLES CARLISLE and EDWIN EsrABnooK, of Norwich,in the county of Windsor and State of Vermont, have invented a new anduseful Machine to be Used in Dressing the Grinding-Faces of Millstones;and we dohereby declare that the following is a full, clear, and eXactdescription of the construction and operation of the same, referencebeing had to the anneXed drawings, making part of this specication, inwhich Figure l is a front elevation of the said machine; Fig. 2 atransverse and central section of it; Fig. 3 is a view of the under sideor bottom of the socket, to be hereinafter described.

To enable others skilled in the art to make and use our invention, wewill now proceed to describe its construction and operation.

To a square piece of timber, (A, Figs. l and 2) of convenient size, andcorresponding in length to the diameter ofthe stone to be dressed, weattach near each end thereof, and perpendicular thereto, a pillar B, ofwood; and at equal distances from and on each side of the center of thesaid timber A, another pillar B, should be similarly attached. To thebottoms of these pillars two others pieces C, C, of square timber areapplied and secured in such manner as to leave the space between theirinner ends sufficiently large to receive the socket H, and allow of itsfree operation. The said pieces of wood A, C and C and pillars B B', BB, should be fastened together by means of iron-bolts, passing upthrough the bottom timbers and the pillars, and secured upon the top ofthe upper timber, by means of nuts, turning upon the screws made uponthe upper ends of the bolts, the said screw bolts being represented bydotted lines. Attached to the top of the upper timber, is an ironstirrup D, fastened by two of the aforesaid bolts on each side of thecenter, and rising a suitable distance above the beam A,

as seen in Fig. 1. A vertical screw E, should i be made to pass and workthrough the top of the stirrup. Near the middle of, and within thestirrup, the bearing F, is arranged. It consists of a plate of iron orother metal of a width somewhat less than the space between the sides ofthe stirrup. It is held in its place by screws a, which project from it,and respectively pass through the opposite sides of the stirrups, andaresecured by nuts c, (Z, on the outside. Through a perforation 4madedownward through the center of the upper timber A, an iron shaft Cr, ispassed, and also up through the bearing F, and abuts against the screwE. To the lower end of this shaftthe socket H, is secured by means o-fscrews e", e, &c., which extend through the upper part of the socket.The socket is made hollow in order to receive the spindle which passesthrough the nether millstone. About midway of the socket on each side isa screw f f', by which the socket is farther coniined to the spindle.Near the lower end of the socket are three screws upon each side g z z',g', 71, z", which pass through the side of the socket; the centralscrews L, h, are also for the purpose of securing the socket to thespindle. The outside screws are for the purpose of fastening the socketto the bale of the upper millstone, when the said stone is to bedressed. The perpendicular shaft Gr, should be of suflicient length toreach from the lower side of the upper timber A, to the top of thestirrup D, and the perpendicular screw E should also be of suiicientlength to reach from the top of the stirrup to the bearing E, near themiddle of the stirrup. The open space between the internal end of thelower timber C, C, and internal pillars B, B, should be of sufficientwidth to span the eye of the millstone, and allow the socket to revolve,and the depth of the open space should be at least one inch more thanthe length of the socket. The timbers C, C, posts B B', B, B, andstirrup D, We

denominate theV frame.

The machine when put together is placed upon that surface o-f themillstone which is to be dressed; the under side of the lower timber C,C being previously covered with coloring matter. The socket should neXtbe made fast to the spindle or bale (as the case may be) by means of theaforementioned screws, which pass through the sides of the said socket.The shaft Gr, isneXt to be adjusted as may be necessary, by means of thescrews which confine it in the upper end of the socket. The frame isneXt let down (by means of the perpendicular screw E, at the top of thestirrup,) so as to carry the timber C, C', in contact with the face ofthe stone. The frame is then revolved, and if found not perfectlyparallel to the face of the stone, it should be rendered so by means oithe adjustable screws and nuts of the bearing F. When thus adjusted theframe is revolved upon the stone, and any inequalities upon the facethereof are detected by means of the coloring matter upon the lowertimbers. The perpendicular screw acts upon the top of the shaft by whichmeans the Whole frame may be raised or lowered at pleasure. This machinemay also be used for dressing stones to which no spindle or bale areattached, the same being effected by inserting into the eye of thestone, a piece of wood, to which the socket may be attached.

/Vhat We claim as our invention and desire to secure by Letters Patent,is-

The combination of the frame herein described with the socket,adjustable shaft, and elevating screws, constructed, and a1'- rangedsubstantially as above set forth.

In testimony whereof we have hereto set our signatures this 20th day ofAugust, A. D. 184:6.

CHARLES CARLISLE. EDWIN ESTABROOK.

Witnesses GEO. LYMAN, IRA DAVIS.

